城市轨道交通对埋地管道造成了严重直流杂散电流干扰。为了了解直流杂散电流对管道的影响, 选取一段受杂散电流干扰较为严重的管道, 采用接地排流和极性排流相结合的方式, 在牺牲阳极处安装极性排流器, 并连续检测排流前后测试桩处的阴极保护电位。对比数据表明, 管道保护电位达到正常值, 管道受到有效保护。

Urban rail transit causes severe DC stray current interference on buried pipelines. In order to understand the DC stray current impact on pipelines, a pipeline which was severely interfered by stray current was selected for testing. Polar drainage and ground drainage were used and a polarity draineger was installed in the testing device. Before and after the drainage, the cathodic protection potential data were continuously monitored at the test stub. The results show that the potential of the pipeline protection reached the normal value and the pipeline was protected.